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Anyone ever have the problem of GC/MS having large peak at 11.6 amu ?
I still can see peaks 69, 219 and 502, but the peakwidth is more than 10 times and normal.
Thanks for any suggestion.
Discussions about GC-MS, LC-MS, LC-FTIR, and other "coupled" analytical techniques.
JMB wrote:
Are you scanning down to m/z 10?
You will burn out the multiplier with the m/ 18, 28 and 32 signals. People generally set scan range at m/z 40-540 or similar in EI mode.
Are the m/z 69, 219 and 512 ions ALL at 10x normal peak width?
Tuning lenses may need cleaning, and/ or resolution potentiometers may need resetting.
Regards,
JMB
thohry wrote:JMB wrote:
Are you scanning down to m/z 10?
You will burn out the multiplier with the m/ 18, 28 and 32 signals. People generally set scan range at m/z 40-540 or similar in EI mode.
Are the m/z 69, 219 and 512 ions ALL at 10x normal peak width?
Tuning lenses may need cleaning, and/ or resolution potentiometers may need resetting.
Regards,
JMB
Thanks for your input.
The peaks 69, 219 and 502 have quite normal shape, only too large !.
We cleaned the source already.
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